#include<unistd.h>
#include"mystdio.h"
#define myfile "test.txt"
int main()
{
    _FILE *fp=_fopen(myfile,"a");
    if(fp==NULL)return 1;
    const char *msg="just a test\n";
    int cnt=10;
    while(cnt)
    {
        _fwrite(fp,msg,strlen(msg));
        sleep(1);
        cnt--;
    }
    _fclose(fp);
    return 0;
}
